Results 71 to 80 of about 5,332 (183)

Galactic Archaeology with the Subaru Prime Focus Spectrograph [PDF]

Proceedings of the International Astronomical Union, 2015
AbstractWe present an overview of our Galactic Archaeology (GA) survey program with the Prime Focus Spectrograph (PFS) for Subaru. Following successful design reviews, the instrument is now under construction with first light anticipated in 2018. Main characteristics of PFS and the science goals in our PFS/GA program are described.
Masashi Chiba, Judith Cohen, Rosemary F. G. Wyse   +2 more
openaire   +1 more source

Reconstruction of Core‐Surface Flows During the Last 3,300 Years

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 3, March 2026.
Abstract Understanding the Earth's magnetic field evolution requires examining the fluid flow at the core‐mantle boundary that drives the changes over different timescales. The inversion process to derive core‐surface flow velocities from secular variation data encounters non‐uniqueness issues, necessitating a priori assumptions that yield different ...
Pablo Rivera, F. J. Pavón‐Carrasco, M. L. Osete   +2 more
wiley   +1 more source

Distance‐Dependent Stray Field Decay in Magnetically Stable Remanence Carriers: Implications for Magnetic Microscopy

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 3, March 2026.
Abstract Micropaleomagnetic analysis offers a path to high‐precision reconstructions of ancient magnetic fields from terrestrial and space‐returned samples by inverting the vertical stray field of individual particles to recover their magnetic moments through the use of magnetic microscopes.
U. D. Bellon, G. F. Souza‐Junior, W. Williams, L. Uieda, A. R. Muxworthy, L. Nagy, G. A. Paterson, C. S. Moraes, R. Fu, R. I. F. Trindade   +9 more
wiley   +1 more source

Asteroseismology And Galactic Archaeology

, 2018
The Milky Way is a complex system, with dynamical and chemical substructures, where several competing processes such as mergers, secular evolution, gas accretion and gas take place. To study how such a giant spiral galaxy was formed and evolved, we need to reconstruct the sequence of its main formation events with high temporal resolution ...
openaire   +2 more sources

The dynamical memory of tidal stellar streams

Astronomy & Astrophysics
Context. Stellar streams offer one of the most sensitive probes of the Milky Way’s gravitational potential, as their phase-space morphology encodes both the tidal field of the host galaxy and the internal structure of their progenitors.
Viterbo Giuseppe, Buck Tobias
doaj   +1 more source

Galactic Archaeology and Asteroseismology: A Synergetic Approach

, 2022
The author is supported by Fundação para a Ciência e a Tecnologia (FCT, Portugal) in the form of a work contract (CEECIND/00476/2018).
openaire   +1 more source

On Unease and Discomfort About the Anthropocene

Earth's Future, Volume 14, Issue 2, February 2026.
Abstract The proposal for a formal inclusion of the Anthropocene as a new unit of the Geologic Time Scale (GTS) was rejected in part on the grounds that it would sit uncomfortably in the GTS. The durations of all GTS units tend to become shorter toward the present. The proposed Anthropocene epoch and Crawfordian age fit that trend comfortably.
Ulrich Stange
wiley   +1 more source

Massive stars: stellar models and stellar yields, impact on Galactic Archaeology

, 2017
The physics of massive stars depends (at least) on convection, mass loss by stellar winds, rotation, magnetic fields and multiplicity. We briefly discuss the impact of the first three processes on the stellar yields trying to identify some guidelines for
Choplin, Arthur, Ekstroem, Sylvia, Georgy, Cyril, Meynet, Georges   +3 more
core   +1 more source

Reduced Geomagnetic Shielding During the Laschamps Excursion and Its Impact on Cosmic‐Ray‐Induced Atmospheric Radiation

Journal of Geophysical Research: Space Physics, Volume 131, Issue 2, February 2026.
Abstract The Laschamps geomagnetic excursion (≈41,000 years BP) was a period of significant weakening and incomplete reversal of the Earth's magnetic field. The weakening substantially reduced geomagnetic shielding against cosmic rays (CRs), which contribute to phenomena at Earth, such as cosmogenic isotope production, and atmospheric ionisation and ...
N. Larsen, I. Usoskin, A. Mishev, S. Koldobskiy, P. Väisänen   +4 more
wiley   +1 more source

Stellar Archaeology -- Exploring the Universe with Metal-Poor Stars

, 2010
The abundance patterns of the most metal-poor stars in the Galactic halo and small dwarf galaxies provide us with a wealth of information about the early Universe.
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core   +1 more source